TM 9-4120-402-14
4-29. POTENTIOMETER (TEMPERATURE CONTROL) (R1).-continued
(2) Carefully pull control panel (4) away from control box (5) as far as harness will allow.
(3) Check potentiometer TEMPERATURE control (6) for general condition and loose, broken, or missing
terminals. Replace potentiometer if damaged.
b. Test
(1)
Using schematic diagram, check resistance across potentiometer TEMPERATURE control (6)
terminals. Resistance across terminals 2 and 3should be 0 to 60 ohms when turned fully
clockwise WARM and 4500 to 5500 ohms when turned fully counterclockwise COOL.
(2)
Replace potentiometer TEMPERATURE control (6) if it tests defective.
c.
Replace.
(1) Loosen two setscrews holding knob (7) to potentiometer TEMPERATURE control (6). Remove knob.
(2) Remove nut (8), lock washer (9), and potentiometer TEMPERATURE control (6).
(3) Tag and unsolder leads from potentiometer TEMPERATURE control (6) terminals. Remove potentiometer
TEMPERATURE control (6).
(4) Cut heat shrink tubing to approximately three-quarter inch (1.9 cm) long.
(5) Slip heat shrinkable tubing over leads.
(6) Solder leads in place on potentiometer TEMPERATURE control (6) terminals using tags and wiring diagram
(7) Slip heat shrinkable tubing over solder connection and shrink in place.
(8) Remove tags.
(9) Install potentiometer TEMPERATURE control (6) into control panel (4) and secure with lock washer (9) and
nut (8).
(10)
Adjust potentiometer TEMPERATURE control (6) shaft to midway point and install knob (7) pointing
midway on TEMPERATURE scale. Secure knob to shaft with two setscrews.
(11)
Secure control panel (4) to box (5) using four sets of screws (1), lock washers (2), and flat washers (3).
d. Adjust.
Adjust potentiometer TEMPERATURE control (6) to desired setting.
NOTE
FOLLOW-ON MAINTENANCE:
Connect power at power source.
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